A novel pathway to clean production of rich-phenol and ketone liquid oil and rich-methane and hydrogen gas by hematite catalytic pyrolysis of pretreated chili straw (CS) was investigated for the first time. The process integrated hydrochloric acid-leaching pretreatment and hematite catalysis. The results indicated that alkali and alkaline earth metals can be dissolved by hydrochloric acid-leaching to reduce the ash content. Moreover, HCl-leaching could improve the yield of the liquid oil generally that increased nearly 8 % after 0.5 mol/L HCl-leaching and the relative content of phenol and ketone in the liquid oil effectually increased. In addition, the presence of hematite increased the content of CH and H, and the yield of liquid oil was improved by 10.39 %. The results of three catalytic pyrolysis experiments with different mass ratios were dearly divergent. Compared with R-1:1 group, the acid content of 0.5 H-1:1 group was significantly reduced, the ketone content was increased by 18.38 %, and only 2.84 % of phenol was decreased which was still 70.59 %. The relative CO content of 0.5H-2:1, 0.5H-1:1, and 0.5H-1:2 groups was reduced by 6.81–21.65 % compared to the 0.5HCl group without catalyst and the total content of combustible gas (CH and H) was also increased by 23.39–37.03 %. This work provided a promising strategy for the high-value utilization of CS and hematite with high yield and quality.

中文翻译：

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盐酸浸出预处理和赤铁矿催化对辣椒秸秆热解产液体油和热解气的协同作用


首次研究了预处理后的辣椒秸秆（CS）赤铁矿催化热解清洁生产富酚酮液体油和富甲烷和氢气的新途径。该工艺集成了盐酸浸出预处理和赤铁矿催化。结果表明，盐酸浸出可以溶解碱金属和碱土金属，降低灰分含量。而且，HCl浸出可以提高液体油的收率，0.5 mol/L HCl浸出后，液体油的收率提高了近8%，并且有效提高了液体油中苯酚和酮的相对含量。此外，赤铁矿的存在增加了CH和H的含量，液体油收率提高了10.39%。三种不同质量比的催化热解实验结果存在较大差异。与R-1:1组相比，0.5H-1:1组酸含量显着降低，酮含量增加18.38%，酚含量仅减少2.84%，仍为70.59%。 0.5H-2:1、0.5H-1:1、0.5H-1:2组相对于无催化剂的0.5HCl组降低了6.81%~21.65%，可燃气体总含量（ CH 和 H) 也增加了 23.39-37.03%。该工作为CS和赤铁矿的高产优质高值利用提供了一种有前景的策略。