<br>酸位点和镓基改性中消旋/微孔催化剂在生物质热解中的协同作用,Renewable Energy

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酸位点和镓基改性中消旋/微孔催化剂在生物质热解中的协同作用
Renewable Energy ( IF 9.0 ) Pub Date : 2022-04-13 , DOI: 10.1016/j.renene.2022.04.048
Xiaocui Wei ₁ , Yang Cao ₂ , Jin Li ₁

Affiliation

通过离子交换（IEX）和浸渍（IMP）对介孔/微孔复合催化剂（ZSM-5@SBA-15）与镓、锌和镍的氧化物进行改性，合成了单金属和双金属催化剂。采用XRD、SEM、TEM、XPS、Py-IR、N2-吸附-脱附等技术对催化剂进行了表征。结果表明，金属被成功引入催化剂中，并且金属的存在促进了布伦斯特德酸向路易斯酸的转化。该催化剂用于生物质热解生产生物油，结果表明，与非金属改性催化剂相比，双金属催化剂催化热解获得的碳氢化合物（如甲苯和萘）的高附加值产品产量显著提高。此外，通过假设各种金属/ZSM-5@SBA-15型催化剂的结构特征和催化性能的系统比较，提出了对性能最佳的Ga/Zn-ZSM-5@SBA-15-iex催化剂（镓、锌改性介5@SBA/微孔ZSM--15）进行催化热解的可能机理，该催化剂具有最高的芳烃选择性和有效还原羰基化合物（如碳氧化合物）。该研究为开发在金属存在下具有酸位协同作用的多功能催化剂提供了指导。

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Synergistic effect of acid sites and a gallium-based modified meso-/microporous catalyst for the pyrolysis of biomass

Single-metal and bimetal catalysts were synthesized by the modification of a meso-/microporous composite catalyst (ZSM-5@SBA-15) with the oxides of gallium, zinc, and nickel by ion exchange (iex) and impregnation (imp). The catalysts were characterized by XRD, SEM, TEM, XPS, Py-IR, N2-adsorption-desorption and other techniques. The results revealed that the metal is successfully introduced into the catalyst and that the presence of the metal promotes the conversion of the Brönsted acid to the Lewis acid. The catalysts were applied for biomass pyrolysis to produce bio-oil, and the results revealed that the yields of high value-added products of hydrocarbons (e.g., toluene and naphthalene) obtained by catalytic pyrolysis over bimetal catalysts are significantly improved in comparison with those over a non-metal modified catalyst. Moreover, the possible mechanism for catalytic pyrolysis over the best-performing catalyst of Ga/Zn-ZSM-5@SBA-15-iex (gallium, zinc-modified meso-/microporous ZSM-5@SBA-15 by the ion-exchange method) with the highest aromatic selectivity and effective reduction of carbonyl compounds (e.g., carboxides) was proposed by assuming the systematic comparison of structural features and catalytic performances of various metal/ZSM-5@SBA-15-type catalysts. The study provides guidance for the development of multifunctional catalysts with a synergistic effect of acid sites in the presence of a metal.

更新日期：2022-04-13

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