In this study, microwave-assisted co-pyrolysis of blends of Indonesian coal (IC) with Indian medium ash coal (MAC), Indian high ash coal (HAC) and coking coal (CC) was performed to evaluate the product yield and quality of the pyrolysis tar, and to understand the interactions during co-pyrolysis. The tar yields from pyrolysis of individual coals, viz., IC, HAC, MAC and CC were 26 ± 3 wt%, 14 ± 2 wt%, 12 ± 2 wt% and 11 ± 2 wt%, respectively. In co-pyrolysis, tar yields decreased with decrease in IC fraction in the mixture. Importantly, the experimental yields of products were similar to that calculated using the mixture rule. However, interactions were evident in the gas and char yields from pyrolysis of IC-rich mixtures, and the deviation from calculated values was in the range of 3–5 wt%. Pyrolysis tar from IC predominantly contained phenols, whereas tars from HAC, MAC, and CC contained aromatic hydrocarbons, phenols and aliphatic hydrocarbons. The interactions were evidenced in the form of enhanced selectivity to naphthalene derivatives and polyaromatic hydrocarbons with a concomitant reduction in the selectivity to simple phenols in the coal tar. Interactions were predominant in equal composition and IC-rich mixtures of IC:HAC, IC:MAC and IC:CC, which is due to the early formation of char via decomposition of IC. Hydrogen and methane constituted a major fraction of pyrolysis gases from MAC, HAC and CC and their blends, while the pyrolysis gas from IC was rich in H₂ and CO₂. Higher heating values of coal chars varied in the range of 21–27 MJ kg⁻¹.

在这项研究中，进行了印度尼西亚煤炭（IC）与印度中灰煤（MAC），印度高灰煤（HAC）和炼焦煤（CC）混合物的微波辅助共热解，以评估产品的收率和质量。热解焦油，并了解共热解过程中的相互作用。来自各个煤热解的焦油收率，即IC，HAC，MAC和CC分别为26±3 wt％，14±2 wt％，12±2 wt％和11±2 wt％。在共热解中，焦油产率随混合物中IC分数的降低而降低。重要的是，产品的实验产量与使用混合法则计算得出的相似。但是，富IC混合物热解产生的气体和焦炭产率之间存在明显的相互作用，与计算值的偏差在3-5 wt％范围内。IC的热解焦油主要含有酚，而来自HAC，MAC和CC的焦油则包含芳族烃，酚和脂肪族烃。相互作用的形式表现为对萘衍生物和聚芳烃的选择性提高，同时对煤焦油中的简单酚的选择性降低。相互作用以相同组成以及IC：HAC，IC：MAC和IC：CC的富含IC的混合物为主，这是由于通过IC分解而早期形成炭的缘故。氢气和甲烷是来自MAC，HAC和CC及其混合物的热解气体的主要部分，而来自IC的热解气体富含H 相互作用的形式表现为对萘衍生物和聚芳烃的选择性提高，同时对煤焦油中的简单酚的选择性降低。相互作用以相同组成以及IC：HAC，IC：MAC和IC：CC的富含IC的混合物为主，这是由于通过IC分解而早期形成炭的缘故。氢气和甲烷是来自MAC，HAC和CC及其混合物的热解气体的主要部分，而来自IC的热解气体富含H 相互作用的形式表现为对萘衍生物和聚芳烃的选择性提高，同时对煤焦油中的简单酚的选择性降低。相互作用以相同组成以及IC：HAC，IC：MAC和IC：CC的富含IC的混合物为主，这是由于通过IC分解而早期形成炭的缘故。氢气和甲烷是来自MAC，HAC和CC及其混合物的热解气体的主要部分，而来自IC的热解气体富含H₂和CO ₂。煤焦的较高的热值在21–27 MJ kg ^-1的范围内变化。