合成气完全甲烷化催化剂的公斤级放大制备及催化反应工艺研究

Kilogram Scale-up Preparation of Catalysts and its Reaction Process in Syngas Methanation

甲烷化催化剂是煤制合成天然气核心技术之一,因此研发合成气完全甲烷化催化剂具有重要意义。研究工作采用实验室小试共沉淀制备甲烷化催化剂的最佳工艺条件方法,进行单批次1、5和10 kg级(代号cat-1、cat-5、cat-10)催化剂的制备研究。研究了催化剂制备的控制因素和放大制备催化剂的反应性能及催化反应工艺条件。研究显示:催化剂制备的控制因素主要包括Na^+含量及晶型结构;放大制备催化剂具有良好的活性、操作稳定性和耐热性能,与小试制备催化剂具有较好的一致性;放大制备催化剂(cat-10)在所考察的还原温度、反应H_2/CO比和10000~40000m L·h^(-1)×g_(cat.)^(-1)反应空速范围内具有良好的甲烷化活性。研究结果表明,该研究单批次公斤级催化剂放大制备是成功的,为实现催化剂进一步放大制备提供了良好基础。

Methanation catalysts play a vital role in the production of synthetic natural gas (SNG) from coal.Based on bench-scale optimum co-precipitation conditions of catalyst preparation, scale up preparation of catalysts for syngas methanation with single batch of 1, 5 and 10 kg is studied. Factors affecting catalyst preparation/performance and scale-up were investigated. The results show that Na+ content and crystal structure of the catalysts are the critical factors, and the catalysts prepared under scale-up conditions possess excellent operation stability and heat resistance, with consistent performance as those from bench-scale samples. The 10 kg batch has good reaction activity under studied conditions. Therefore, the scale-up preparation is successful for the methanation catalyst in this study, which is useful for future scale-up preparation of related catalysts.