Coal gangue is a typical waste produced during coal mining and washing. Synthesis of zeolites via coal gangue can contribute to resource recycling and environmental protection. In this study, high-silica SSZ-13 was synthesized by one-step hydrothermal synthesis from coal gangue without the traditional pretreatment methods of high-temperature roasting and alkali melting, making it more convenient and energy efficient. The synthesis time, gel silicon–aluminum ratio and silicon source were systematically studied to optimize the synthesis of SSZ-13. Experimental results indicated that the nucleation time of SSZ-13 could be shortened to 7 h, which was half the synthesis time by using chemicals. Tetrahedral aluminum was the main factor for rapid synthesis, which also accelerated the transformation of octahedral aluminum and further accelerated the synthesis of SSZ-13. The DeNOx activity of the synthesized Cu-SSZ-13 was over 90% across a broad range from 180 to 400 °C, and it remained over 85% in this temperature range even after hydrothermal treatment for 12 h. It also demonstrated good water resistance (over 95% DeNOx in the range of 200 to 400 °C) and sulfur resistance (over 95% DeNOx in the presence of 100 ppm SO₂).

中文翻译：

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煤石快速合成SSZ-13分子筛及其NH3-SCR活性

煤石是煤炭开采和洗涤过程中产生的典型废物。沸石的合成通过煤gang石可以促进资源循环利用和环境保护。本研究采用煤石一步水热合成法制备高硅SSZ-13，无需传统的高温焙烧和碱熔预处理方法，使其更加方便，高效。系统地研究了合成时间，凝胶硅铝比和硅源，以优化SSZ-13的合成。实验结果表明，SSZ-13的成核时间可缩短至7 h，仅为化学合成时间的一半。四面体铝是快速合成的主要因素，这也加速了八面体铝的转化并进一步加速了SSZ-13的合成。合成的Cu-SSZ-13的DeNOx活性在180至400°C的宽范围内均超过90％，即使在水热处理12 h后，其在该温度范围内仍保持超过85％。它还显示出良好的耐水性（在200至400°C范围内，DeNOx超过95％）和耐硫性（在100 ppm SO存在下，DeNOx超过95％）₂）。