The mesoporous silicate molecular sieve, MCM-41, has been synthesized from pulverized coal fly ash (PFA), where the silicate filtrate used is a by-product from hydrothermal zeolite production. Rice husk ash was also used for comparison but fusion with sodium hydroxide was used to prepare the silicate filtrate, along similar lines to earlier reports of using PFA as a precursor for MCM-41 synthesis. The MCM-41 samples are chemically and mineralogically similar to a commercially available sample, but with higher pore volumes dominated by mesopores (0.92–1.13 cf. 0.88 cm³ g⁻¹). After polyethyleneimine (PEI) impregnation for CO₂ capture, the ash derived MCM-41 samples displayed higher uptakes than the commercial sample with the maximum achievable PEI loading of 60 Wt.% PEI (dry basis) before particle agglomeration occurs, approximately 13 compared to 11 Wt.%, respectively, the latter being comparable to earlier reports in the literature. The PFA sample that displays the fastest kinetics to achieve 90% of the equilibrium uptake had the largest mesopore volume of 1.13 cm³ g⁻¹. Given the PFA-derived MCM-41 uses a waste silicate solution for hydrothermal preparation and no prior preparation is needed, production costs are estimated to be considerable lower where silicate solutions need to be prepared by base treatment, even if ash is used, as for the RHA derived MCM-41 used here.

介孔硅酸盐分子筛MCM-41是由粉煤灰（PFA）合成的，其中使用的硅酸盐滤液是水热沸石生产的副产品。稻壳灰也用于比较，但与氢氧化钠熔融用于制备硅酸盐滤液，与早期报道的使用PFA作为MCM-41合成前体的报道相似。MCM-41样品在化学和矿物学上与市售样品相似，但孔体积以中孔为主（0.92-1.13 cf. 0.88 cm ³  g ^-1）。聚乙烯亚胺（PEI）浸渍后的CO ₂捕获后，灰分衍生的MCM-41样品显示出比市售样品更高的吸收率，颗粒团聚前最大可达到的PEI负载为60 Wt。％PEI（干基），分别约为13 Wt。％和11 Wt。％与文献中较早的报告具有可比性。显示最快的动力学以实现90％的平衡摄取的PFA样品的最​​大中孔体积为1.13 cm ³  g ^-1。鉴于源自PFA的MCM-41使用废硅酸盐溶液进行水热制备，并且不需要事先制备，因此即使需要使用灰分，即使需要使用灰分，也需要通过碱处理制备硅酸盐溶液的情况下，生产成本估计要低得多。这里使用的是RHA衍生的MCM-41。