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Optimized CWPO oxidation of natural organic matter in continuous fixed bed reactor catalyzed by an extruded Al/Fe-PILC clay catalyst
Journal of Environmental Chemical Engineering ( IF 7.4 ) Pub Date : 2020-10-17 , DOI: 10.1016/j.jece.2020.104634
Gustavo Pinchao , Lucia Ortiz , Luis-Alejandro Galeano , Arsenio Hidalgo , José-Herney Ramírez

Catalytic wet peroxide oxidation of dissolved natural organic matter (NOM) has been optimized in a continuous-flow, fixed bed reactor by using an extruded Al/Fe-pillared clay catalyst using a Synthetic Surrogate of NOM (SS-NOM) resembling typical composition and molecular weight distributions in real surface waters. Proper humidity of the extrudate’s precursor mix was found to be 38 %. Mass fraction of catalyst (xc = 0.5), absolute humidity (H = 0.6), and a height/diameter ratio = 2.0 (particle ϕ ∼ 3.0 mm and height ∼ 6.0 mm) showed the best combined mechanical and textural properties (compression strength 121 N, tenacity 1.1325 mJ, attrition 1.45 (%), BET surface 76 m2/g, and microporous surface 52 m2/g) and catalytic performance. The main parameters governing the catalytic wet peroxide oxidation (height of the catalyst bed and the ratio (H2O2/SS-NOM) were optimized in terms of mineralization of the total organic carbon and H2O2 reaction efficiency, under constant and rather short 9.2 min of residence time. Inlet concentrations of the SS-NOM (TOC = 6.63 – 13.7 mg C/dm3), pH (5.9 – 7.8) and temperature (20.0 °C – 24.0 °C) were covariates within the typical ranges exhibited by surface waters. The optimal multi-response catalytic performance using desirability function (d = 0.73) displayed 24.3 % of TOC mineralization and 51.2 % of reacted H2O2 with a height of catalyst bed 22 cm and inlet ratio (H2O2/SS-NOM) = 5.9 (mg H2O2/mg TOC), room temperature (20.0 ± 1.0 °C), and circumneutral pH.



中文翻译:

Al / Fe-PILC挤压粘土催化剂在连续固定床反应器中优化天然有机物的CWPO氧化

在连续流固定床反应器中,通过使用挤压的Al / Fe柱状粘土催化剂(采用类似于典型组成的NOM的合成替代品(SS-NOM)),对溶解的天然有机物(NOM)的催化湿式过氧化物氧化进行了优化。实际地表水中的分子量分布。发现挤出物的前体混合物的适当湿度为38%。催化剂的质量分数(x c = 0.5),绝对湿度(H = 0.6)和高度/直径比= 2.0(颗粒ϕ〜3.0 mm和高度〜6.0 mm)显示出最佳的机械和组织性能组合(压缩强度) 121 N,韧度1.1325 mJ,损耗1.45(%),BET表面76 m 2 / g,微孔表面52 m 2/ g)和催化性能。在总有机碳矿化和H 2 O 2反应效率方面,优化了控制湿式过氧化物催化氧化的主要参数(催化剂床的高度和比例(H 2 O 2 / SS-NOM))。停留时间较短,仅为9.2分钟; SS-NOM的进口浓度(TOC = 6.63 – 13.7 mg C / dm 3),pH(5.9 – 7.8)和温度(20.0°C – 24.0°C)是典型范围内的协变量。利用合意函数(d  = 0.73)的最佳多反应催化性能显示TOC矿化度为24.3%,反应的H 2 O为51.2%2与催化剂床的高度22厘米和入口比(H 2 ö 2 / SS-NOM)= 5.9(毫克ħ 2 ö 2 /毫克TOC),室温(20.0±1.0℃),和circumneutral pH值。

更新日期:2020-10-19
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