Elucidation of the formation mechanism of β-SiAlON from a zeolite
Elucidation of the formation mechanism of β-SiAlON from a zeolite
复制标题
DOI：
10.1111/j.1551-2916.2007.01576.x
复制
发表时间：
2007-05
影响因子：
3.9
通讯作者：
F. Li;T. Wakihara;Junichi Tatami;K. Komeya;T. Meguro;K. MacKenzie
中科院分区：
文献类型：
--
作者：
F. Li;T. Wakihara;Junichi Tatami;K. Komeya;T. Meguro;K. MacKenzie
以Y型分子筛为原料合成了β-SiAlON，利用魔角旋转核磁共振（NMR）和X射线粉末衍射（XRD）研究了β-SiAlON的形成机理。将Y型沸石和碳粉末混合36小时，在流动气体（0.5L/min N2）中在1050° C至1450°C下烧制0-2小时，然后在空气中在700°C下热处理2小时以除去残余碳。根据XRD分析，所得产物为单相β-SiAlON;但在NMR光谱中检测到少量未反应的SiO2和SiC（可能是无定形的）。结果表明，高Z值和低Z值的β-SiAlON是通过不同的反应途径形成的。
β-SiAlON was synthesized from Y-type zeolite and its formation mechanism was determined using magic-angle spinning nuclear magnetic resonance (NMR) spectroscopy and powder X-ray diffraction (XRD). Y-type zeolite and carbon powders were mixed for 36 h, fired at 1050° to 1450°C for 0–2 h in flowing gas (0.5 L/min N2), then heat treated at 700°C for 2 h in air to remove residual carbon. The resulting product was, according to XRD analysis, mono-phase β-SiAlON; but minor amounts of unreacted SiO2 and SiC (possibly amorphous) were detected in the NMR spectra. It was found that β-SiAlONs with higher and lower Z values are formed by different reaction pathways.