English
РусскийВлияние примесей переходных металлов Fe, Ni и Co на кинетику гидролиза BH₄−ионов в щелочных растворах
Исследовалось влияние небольших количеств примесей Fe, Co и Ni на самопроизвольный процесс гидролиза борогидрида в интервале температур 60–100°C. Исследуемый объект представлял собой модельный раствор, содержащий 9.53 М OH−-ионов и 0.14 М BH4−-ионов и используемый в качестве топлива для борогидридных топливных элементов. Оценена константа скорости гидролиза борогидрида k для небольшого количества примесей при разных температурах. Установлены самые низкие не ускоряющие гидролиз концентрации примесей ( ∼ 10 ppm для железа; ∼ 1 ppm для кобальта). Наибольшее ускоряющее действие на гидролиз BH4−-ионов оказали примеси никеля: самогидролиз ускорился в 1.2 раза для 1 ppm Ni. Неоднозначный ход кинетических кривых не позволяет точно оценить энергию активации, однако увеличение температуры усиливает каталитический эффект ускорения гидролиза в полном соответствии с уравнением Аррениуса.
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