Current Challenges and Perspectives for Biomass Catalytic Pyrolysis: Comparison
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Lignocellulosic biomass is an excellent alternative of fossil source owing to the fact that it is low-cost, plentiful and environmentally friendly. Through pyrolysis, lignocellulosic biomass can be converted into the potential precusor of liquid fuel or platform chemicals. Therefore, the detailed knowledge and mechanism about biomass conversion should be overviewed and concluded. We have reviewed several factors which impact the conversion of biomass, including the properties of biomass, operational parameters of catalytic pyrolysis and different types of pyrolysis equipment. Meantime, some perspectives for future development have been proposed in the end.Lignocellulosic biomass is an excellent alternative of fossil source because it is low-cost, plentiful and environmentally friendly, and it can be transformed into biogas, bio-oil and biochar through pyrolysis; thereby, the three types of pyrolytic products can be upgraded or improved to satisfy the standard of biofuel, chemicals and energy materials for industries. The bio-oil derived from direct pyrolysis shows some disadvantages: high contents of oxygenates, water and acids, easy-aging and so forth, which restrict the large-scale application and commercialization of bio-oil. Catalytic pyrolysis favors the refinement of bio-oil through deoxygenation, cracking, decarboxylation, decarbonylation reactions and so on, which could occur on the specified reaction sites. Therefore, the catalytic pyrolysis of lignocellulosic biomass is a promising approach for the production of high quality and renewable biofuels. This review gives information about the factors which might determine the catalytic pyrolysis output, including the properties of biomass, operational parameters of catalytic pyrolysis and different types of pyrolysis equipment. Catalysts used in recent research studies aiming to explore the catalytic pyrolysis conversion of biomass to high quality biooil or chemicals are discussed, and the current challenges and future perspectives for biomass catalytic pyrolysis are highlighted for further comprehension.

  • biomass
  • catalysts
  • pyrolysis
  • biofuel

1. Introduction

During the past several decades, research studies have mainly focused on three strategies for the optimal harnessing of biomass from pyrolysis, as shown in Figure 1. The first one is the pretreatment of raw biomass. It is reported that the characteristics of biomass can be influenced by different kinds of pretreatment methods [1][2][3], such as grinding, torrefaction, chemical or biological pretreatment. Therefore, the pretreated biomass may yield high quality bio-oil. Secondly, refinement of bio-oil is another choice for further utilization [4][5]. After the liquid products are obtained from direct pyrolysis of biomass, some oriented catalysts can be used to improve the quality. Or some separation and purification approaches can be applied to obtain the single chemicals. Thirdly, catalysts are introduced to the pyrolysis process to change the distribution of chemicals in bio-oil products directly [6][7][8]. Compared to the former two methods, catalytic pyrolysis outstands as the form of one-pot reaction, which simplifies significantly the technological process, especially avoiding the cooling and reheating of the obtained liquid products.

Figure 1. The three strategies for biomass pyrolytic conversion

2. Factors Affecting the Catalytic Pyrolysis of Biomass

There are some key factors for catalytic pyrolysis of biomass,  including biomass species, categories of reactor and catalyst as shown in Figure.6 .

Figure 6. The factors that affecting the pyrolysis of lignocellulosic biomass.

Lignocellulosic biomass: different kinds of biomass feedstocks contain different amounts of cellulose, hemicellulose and lignin, and the interactions between the three major components also varies. In addition, the polymer structure, cross-linkages, density, thermal conductivity, airflow permeability or specific heat capacity of different biomass also have large differences, which may lead to different pyrolysis performance [9].

Diversity of reactor: miscellaneous reactors have been used and explored for catalytic pyrolysis in a small scale, such as fluidized bed, circulating fluidized bed, fixed bed, ablative, rotative, auger, vacuum and microwave reactors. 

Process parameters (temperature, heating rate, and volatiles residence time): Taking these pyrolysis parameters into consideration, low temperature, low heating rate and long VRT are conducive to the formation of biochar; high temperature, high heating rate and long VRT are beneficial for the generation of gas products; and medium temperature, high heating rate and short VRT favor the production of bio-oil with a higher yield.

Position of catalysts: Compared with the ex-situ, the cost of in-situ mode is comparatively low, and the catalysts loaded not only participate in the catalytic process but also act as heat carriers. In addition, it is much more direct and quick for pyrolytic volatiles to undergo the further reaction. However, the coke formation and difficulties in catalyst recovery make the in-situ mode less competitive. Ex-situ is beneficial to control the secondary upgrading process flexibly, including catalyst species, reaction temperature, reaction gas atmosphere and so on. Before the catalytic pyrolysis technique is determined or improved, all aspects, for instance, the cost of device and catalysts, are needed to be taken into consideration.

The type of catalysts: Zeolites,  metal oxide catalysts, soluble inorganic salts, and other low-cost materials.

3. Challenges and Future Perspectives

CatalyticThe pymoderolysis of lignocellulosic biomass is a promising technology for the generation of biofuels, and it is stilln industrial development and considerable increase in global population resulted in the initial stage, which is far from commercializasubstantial growth in worldwide energy consumption. Although huge progress in catalyst modification and catalytic pyrolysiHowever, the large-scale consumption of fossil resources has been made, the yield and quality of fuel-grade bio-oil still faces significant challenges. The following should be investigated, in order of priority.
(1)rought a series of eco-environmental crises, such as global warming, destruction of the ozone layer, acid rain, land desertification and so forth, Swhince lignocellulosic biomass varies in composition and structure in terms of species, it ich challenged the sustainable development of all walks of the world. These related questions necessary toitate the develop analytical methods and technology to characterize rawment and use of renewable resources as alternatives, such as solar, wind, tidal, geothermal and biomass or its single component at the molecular level. Then, these biomass species can be classified into particular categories, which is beneficial to design oriented catalysts,. Among these choices, biomass, the only renewable carbon resource, has attained a large amount of attention due to its abundant reservation and low cost [1]. Approximathereby obtaining the high conversion rateely 1700 billion tons of biomass and high-quality biofuels. For example, for the efficient conversion of woodycan be harvested each year, which is equivalent to 850 billion tons of standard coal or 600 billion tons of oil biomass[2]. speAccies, one catalytic system might be designed and developed, while for algae, it is needed to develop another one. Furthermore, it should be estimated whether the raw ording to the data published by the International Energy Agency, 10% of global basic energy consumption will be supplied by biomass or the isolated component from biomass is more conductive to catalytic pyrolysis for desirable products,by 2023, and approximately 27% of worldwide transportation fuel will be supplied by biomass by 2050 [3]. aSinchieving the effective conversione the development and utilization of biomass to the greatest extent.
(2)have the potential and feasibility in Howhandling to fully exert the role of solid catalysts to solidsustainable development and environmental problems, effective policies promoting the use of biomass is another tough task. When the solid catalyst is mixed with biomass evenlyhave been issued in many countries. For example, the pyrolytic volatiles can arrive at the active sites on catalyst quickly for the following secondary reactions towards aromatic hydrocarbons or deoxygenated compoundsDutch Ministry of Economic Affairs requires that approximately 30% of transportation fuel should be derived from biomass and 20–45% of non-renewable resource are replaced by biomass until 2040 [4]. HowThever, the solid catalysts only have an impact on the secondary reactions, while the initial thermal decomposition stage of biomass is not affected. The introduction of soluble salts might be a U.S. Department of Agriculture and U.S. Department of Energy set goals that biofuels must take the place of one-fifth of transportation fuel and one quarter of oil-based platform chemicals by 2030 promising[2]. approacTh, which can be mixed evenly with us, there is an urgent demand to integrate renewable biomass and attached to the biomass surface, thereby changing the intrinsic structure and boosting the tenergy into contemporary energy systems for modern society towards a sustainable process.
Thermal conversion ratemethods of biomass. Nevertheless, soluble salts as catalysts are accompanied with the introduction of anions, such as Cl−, SO42−, NO3−, CO32− consist of direct combustion, liquefaction, fermentation, pyrolysis, gasification and othsuper organic acid ionscritical fluid conversion [5][6]. TAmong these anions pose a threat on the safety and staways, pyrolysis is one of the most promising methods due to its feasibility of bio-products. For example, it can be difficult to remove the SxOy,in industrialization, low cost in NxOyinstallation orand other undesirable gas productsconvenience in operation from[2][5][7]. pPyrolytic gas, and some toxic chemicals, such as chlorinated hydrocarbons and dioxins, might be generated during the pyrolysis of biomass.
(3)sis of biomass refers to the process where biomass is converted to bio-oil, biogas and Tche accurate analytical technology for the reaction intermediates in pyrolysis needs to be urgently developed. These intermediates could not be identified clearly and the informarcoal in an inert atmosphere at high temperatures of approximately 400–600 °C. Among these products, bio-oil has been widely used to produce transportation about the real catalytic pyrolysis process is still scarce. Therefore, the development of analyticalfuel or platform chemicals through refinery technology that holds the ability to qualify and quantify the large-molecular weight fragments in-situ, for example, the hydrodeoxygenation process is[8]. quitHoweve promising for the overall comprehension of the reaction mechanism. Only when the structure and properties of pyrolytic volatiles or reaction intermediates are understood clearly, could the oriented catalysts be conceived and developed. Furthermore, the comprehensive analysis andr, pyrolysis of lignocellulosic biomass is a quite complex process, because a range of parameters contribute to the quality of bio-oil in the meantime, such as biomass species, pyrolysis conditions and so on [9]. cTharacterization of e raw bio-oil derived from catalyticdirect pyrolysis is of great importance. Precisely figuring out the chemical composition of the liquid phase i of biomass has several drawbacks: high corrosivity and viscosity, low heating value, high oxygen and water contents t[10][11][12], whiche prerequisite of further upgrading and hinder the direct utilization.
(4) Theas stability and reutiliztransportation of catalyst is another significant issue for catalytic pyrolysis technique feasibility and economy, and it is vital to develop the ability of coke resistance. To achievefuels. During the past several decades, research studies have mainly focused on three strategies for the optimal harnessing of biomass from pyrolysis, as shown in thisFigure 1. goal, tThe first step is to clarify the detailed catalytic conversion mechanism of pyrolysis vapor that occurred on the active site of the surface or channels of catalysts. On the other hand, the design of pyrolysis reactor that allowone is the pretreatment of raw biomass. It is reported that the characteristics of biomass can be influenced by different kinds of pretreatment methods for[13][14][15], tsuche in-situ regeneration of catalysts may help reduce the capital invested in the technical routes of biomass pyrolysis as grinding, torrefaction, chemical or biological pretreatment. Therefore, the pretreated biomass may yield high quality bio-oil.
(5) ThSe cost or investcondly, refinement of catalyst determines the overall economics of the biomassbio-oil is another choice for further utilization [16][17]. pyAfterolysis process, so it is necessary to exert techno-economic ana the liquid products are obtained from direct pyrolysis and life cycle analysis of the selecof biomass, some oriented catalyst. Furthermore, whether the corresponding technical route is suitable for the environment, or allowed with national policies, should be taken into account first before scaling up.
(6) Industrs can be used to improve the quality. Or some separation and purification approaches can be applied to obtain the single chemicalization of biomasss. Thirdly, catalytic sts are introduced to the pyrolysis technology still faces many challenges. Firstly, the mixing of catalysts and biomass particlesprocess to change the distribution of chemicals in bio-oil products directly is[18][19][20]. tCough to be guaranteed in large scale, which makesmpared to the former two methods, catalysts invalid; at the same time, the recovery of the used catalysts could not be easily realized, which incytic pyrolysis outstands as the form of one-pot reaction, which simplifies significantly the technological process, especially avoiding the cooling and reheating of the obtained liquid products.
Catalysts 12 01524 g001 550
Figure 1. The three strategies for biomass pyrolytic conversion.
Numereaous ses the cost. Secondly, the heat and mass transfer become significantly difficult owing to the propertiestudies have focused on the catalysts used for the catalytic conversion of lignocellulosic biomass, so large amountfor example, metal oxides of[21][22][23], einergyorganic salts [24][25][26], aneed to be suppliedd zeolites to[27][28][29]. tThe large-scale pyrolysis device. Last but not least, the diversity of biomass species and wide distribution of biomass both make the biomass pyrolysis industry tough to develop towards a large scaleaddition of catalyst is expected to decrease the reaction activation energy and change the reaction pathway, yielding high-quality bio-oil and high-value platform chemicals.

Figure 6. The factors that affecting the pyrolysis of lignocellulosic biomass.

3. Challenges and Future Perspectives

Catalytic pyrolysis of lignocellulosic biomass is a promising technology for the generation of biofuels, and it is still in the initial stage, which is far from commercialization. Although huge progress in catalyst modification and catalytic pyrolysis has been made, the yield and quality of fuel-grade bio-oil still faces significant challenges. The following should be investigated, in order of priority.

(1) Since lignocellulosic biomass varies in composition and structure in terms of species, it is necessary to develop analytical methods and technology to characterize raw biomass or its single component at the molecular level. Then, these biomass species can be classified into particular categories, which is beneficial to design oriented catalysts, thereby obtaining the high conversion rate of biomass and high-quality biofuels. For example, for the efficient conversion of woody biomass species, one catalytic system might be designed and developed, while for algae, it is needed to develop another one. Furthermore, it should be estimated whether the raw biomass or the isolated component from biomass is more conductive to catalytic pyrolysis for desirable products, achieving the effective conversion and utilization of biomass to the greatest extent.

(2) How to fully exert the role of solid catalysts to solid biomass is another tough task. When the solid catalyst is mixed with biomass evenly, the pyrolytic volatiles can arrive at the active sites on catalyst quickly for the following secondary reactions towards aromatic hydrocarbons or deoxygenated compounds. However, the solid catalysts only have an impact on the secondary reactions, while the initial thermal decomposition stage of biomass is not affected. The introduction of soluble salts might be a promising approach, which can be mixed evenly with biomass and attached to the biomass surface, thereby changing the intrinsic structure and boosting the thermal conversion rate of biomass. Nevertheless, soluble salts as catalysts are accompanied with the introduction of anions, such as Cl−, SO42−, NO3−, CO32− and other organic acid ions. These anions pose a threat on the safety and stability of bio-products. For example, it can be difficult to remove the SxOy, NxOy or other undesirable gas products from pyrolytic gas, and some toxic chemicals might be generated during the pyrolysis of biomass, such as chlorinated hydrocarbons and dioxins.

(3) The accurate analytical technology for the reaction intermediates in pyrolysis needs to be urgently developed. These intermediates could not be identified clearly and the information about the real catalytic pyrolysis process is still scarce. Therefore, the development of analytical technology that holds the ability to qualify and quantify the large-molecular weight fragments in-situ is quite promising for the overall comprehension of the reaction mechanism. Only when the structure and properties of pyrolytic volatiles or reaction intermediates are understood clearly, could the oriented catalysts be conceived and developed. Furthermore, the comprehensive analysis and characterization of bio-oil derived from catalytic pyrolysis is of great importance. Precisely figuring out the chemical composition of the liquid phase is the prerequisite of further upgrading and utilization.

(4) The stability and reutilization of catalyst is another significant issue for catalytic pyrolysis technique feasibility and economy, and it is vital to develop the ability of coke resistance. To achieve this goal, the first step is to clarify the detailed catalytic conversion mechanism of pyrolysis vapor that occurred on the active site of the surface or channels of catalysts. On the other hand, the design of pyrolysis reactor that allows for the in-situ regeneration of catalysts may help reduce the capital invested in the technique routes of biomass pyrolysis.

(5) The cost or investment of catalyst determines the overall economics of the biomass pyrolysis process, so it is necessary to exert techno-economic analysis and life cycle analysis of the selected catalyst. Furthermore, whether the corresponding technique route is suitable for the environment, or allowed with national policies, should be taken into account first before scaling up.

(6) Industrialization of biomass catalytic pyrolysis technology still faces many challenges. Firstly, the mixing of catalysts and biomass particles is tough to be guaranteed in large scale, which makes catalysts invalid; at the same time, the recovery of the used catalysts could not be easily realized, which increases the cost. Secondly, the heat and mass transfer become significantly difficult owing to the properties of lignocellulosic biomass, so large amounts of energy need to be supplied to the large-scale pyrolysis device. Last but not least, the diversity of biomass species and wide distribution of biomass both make the biomass pyrolysis industry tough to develop towards a large scale.

References

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