凹凸棒石黏土催化裂解生物质焦油

BIOMASS TAR CATALYTIC CRACKING USE PALYGORSKITE AS CATALYS

以凹凸棒石黏土作为天然催化剂催化裂解生物质气化焦油,在固定床反应器中,考察催化剂用量、粒径、煅烧温度、气相滞留时间以及反应温度等操作条件对凹凸棒石黏土催化焦油裂解活性的影响;通过XRD表征分析了催化剂的结构变化情况。与热裂解相比,凹凸棒石黏土对生物质焦油有显著的催化裂解作用。随着裂解温度的升高,焦油转化率、氢产率及氢选择性都显著增加。凹凸棒石黏土的煅烧处理能够改善催化活性,但过高的煅烧温度将破坏凹凸棒石黏土的特征结构,从而不利于其催化效率。

Palygorskite clay was pretreated as catalysts for catalytic destruction of biomass tar formed during gasification of biomass. The catalytic activity measurement was carried out in a fixed bed reactor. Effects of catalysts＇ weight, particle size, calcinations temperature, residence time and cracking temperature on catalytic activity of tar cracking were investigated. Properties and structure of the catalyst after reaction was characterized by means of XRD. Compared with pyrolysis, palygorskite has a remarkable catalytic cracking on biomass tar. Tar conversion, hydrogen yield and hydrogen selectivity could be increased significantly as the cracking temperature rise. The catalytic activity of palygorskite could be improved by calcination treatment. However, the catalytic activity could be reduced by high temperature calcination.